70 lines
3.2 KiB
JavaScript
70 lines
3.2 KiB
JavaScript
|
// @@split logic
|
||
|
|
require('./_fix-re-wks')('split', 2, function(defined, SPLIT, $split){
|
||
|
|
'use strict';
|
||
|
|
var isRegExp = require('./_is-regexp')
|
||
|
|
, _split = $split
|
||
|
|
, $push = [].push
|
||
|
|
, $SPLIT = 'split'
|
||
|
|
, LENGTH = 'length'
|
||
|
|
, LAST_INDEX = 'lastIndex';
|
||
|
|
if(
|
||
|
|
'abbc'[$SPLIT](/(b)*/)[1] == 'c' ||
|
||
|
|
'test'[$SPLIT](/(?:)/, -1)[LENGTH] != 4 ||
|
||
|
|
'ab'[$SPLIT](/(?:ab)*/)[LENGTH] != 2 ||
|
||
|
|
'.'[$SPLIT](/(.?)(.?)/)[LENGTH] != 4 ||
|
||
|
|
'.'[$SPLIT](/()()/)[LENGTH] > 1 ||
|
||
|
|
''[$SPLIT](/.?/)[LENGTH]
|
||
|
|
){
|
||
|
|
var NPCG = /()??/.exec('')[1] === undefined; // nonparticipating capturing group
|
||
|
|
// based on es5-shim implementation, need to rework it
|
||
|
|
$split = function(separator, limit){
|
||
|
|
var string = String(this);
|
||
|
|
if(separator === undefined && limit === 0)return [];
|
||
|
|
// If `separator` is not a regex, use native split
|
||
|
|
if(!isRegExp(separator))return _split.call(string, separator, limit);
|
||
|
|
var output = [];
|
||
|
|
var flags = (separator.ignoreCase ? 'i' : '') +
|
||
|
|
(separator.multiline ? 'm' : '') +
|
||
|
|
(separator.unicode ? 'u' : '') +
|
||
|
|
(separator.sticky ? 'y' : '');
|
||
|
|
var lastLastIndex = 0;
|
||
|
|
var splitLimit = limit === undefined ? 4294967295 : limit >>> 0;
|
||
|
|
// Make `global` and avoid `lastIndex` issues by working with a copy
|
||
|
|
var separatorCopy = new RegExp(separator.source, flags + 'g');
|
||
|
|
var separator2, match, lastIndex, lastLength, i;
|
||
|
|
// Doesn't need flags gy, but they don't hurt
|
||
|
|
if(!NPCG)separator2 = new RegExp('^' + separatorCopy.source + '$(?!\\s)', flags);
|
||
|
|
while(match = separatorCopy.exec(string)){
|
||
|
|
// `separatorCopy.lastIndex` is not reliable cross-browser
|
||
|
|
lastIndex = match.index + match[0][LENGTH];
|
||
|
|
if(lastIndex > lastLastIndex){
|
||
|
|
output.push(string.slice(lastLastIndex, match.index));
|
||
|
|
// Fix browsers whose `exec` methods don't consistently return `undefined` for NPCG
|
||
|
|
if(!NPCG && match[LENGTH] > 1)match[0].replace(separator2, function(){
|
||
|
|
for(i = 1; i < arguments[LENGTH] - 2; i++)if(arguments[i] === undefined)match[i] = undefined;
|
||
|
|
});
|
||
|
|
if(match[LENGTH] > 1 && match.index < string[LENGTH])$push.apply(output, match.slice(1));
|
||
|
|
lastLength = match[0][LENGTH];
|
||
|
|
lastLastIndex = lastIndex;
|
||
|
|
if(output[LENGTH] >= splitLimit)break;
|
||
|
|
}
|
||
|
|
if(separatorCopy[LAST_INDEX] === match.index)separatorCopy[LAST_INDEX]++; // Avoid an infinite loop
|
||
|
|
}
|
||
|
|
if(lastLastIndex === string[LENGTH]){
|
||
|
|
if(lastLength || !separatorCopy.test(''))output.push('');
|
||
|
|
} else output.push(string.slice(lastLastIndex));
|
||
|
|
return output[LENGTH] > splitLimit ? output.slice(0, splitLimit) : output;
|
||
|
|
};
|
||
|
|
// Chakra, V8
|
||
|
|
} else if('0'[$SPLIT](undefined, 0)[LENGTH]){
|
||
|
|
$split = function(separator, limit){
|
||
|
|
return separator === undefined && limit === 0 ? [] : _split.call(this, separator, limit);
|
||
|
|
};
|
||
|
|
}
|
||
|
|
// 21.1.3.17 String.prototype.split(separator, limit)
|
||
|
|
return [function split(separator, limit){
|
||
|
|
var O = defined(this)
|
||
|
|
, fn = separator == undefined ? undefined : separator[SPLIT];
|
||
|
|
return fn !== undefined ? fn.call(separator, O, limit) : $split.call(String(O), separator, limit);
|
||
|
|
}, $split];
|
||
|
|
});
|